Leatherback turtles are ancient creatures with a modern problem: Plastic.

A new study looked at necropsy reports of more than 400 leatherbacks that have died since 1885 and found plastic in the digestive systems of more than a third of the animals. Besides plastic bags, the turtles had swallowed fishing lines, balloon fragments, spoons, candy wrappers and more.

Plastic was probably not the cause of death in most cases. Nevertheless, the study is an important wake-up call for a growing garbage problem.